TwitterThyssenkrupp AG Chief Executive Officer Heinrich Hiesinger resigned days after the company inked a deal for a European steel joint venture that faced fierce investor opposition. “Today I informed the Supervisory Board that I would like to step down from my position,” Hiesinger said in a statement on Thursday. Hiesinger’s leadership at Thyssenkrupp had been marked by criticism for the company’s declining revenue, rising costs and a declining stock price...